SAE TECHNICAL PA PER SERIES Torque Converter Clutch Slip Control System Katsumi Kono, Hiroshi Itoh, Shinya Nakamura, and Kenichi Yoshizawa Toyota Motor Corp. Masataka Osawa Toyota Central R&D Labs., Inc. Reprinted from: New Developments in Transmission and Driveline Design (SP-1087) The Engineering Society ** =For Advancing Mobility and Sea Air and Spacem International Congress and Exposition Detroit, Michigan February 27 - March 2,1995 400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (41 2)776-4841 Fax:(412)776-5760 Downloaded from SAE International by University of Wisconsin - Madison , Saturday, September 08, 2018The appearance of the lSSN code at the bottom of this page indicates SAE's consent that copies of the paper may be made for personal or internal use of specific clients. This consent is given on the condition, however, that the copier pay a$5.00 per article copy fee through the Copyright Clearance Center, Inc. Operations Center, 222 Rosewood Drive, Danvers, MA 01 923for copying beyond that per~nitted by Sections 107 or 108 of the U.S. Copyright Law. This consent does not extend to other kinds of copying such as copying for general distribution, for advertising or promotional purposes, for creating new collective works, or for resale. SAE routinely stocks printed papers for a period of three years following date of publication. Direct your orders to SAE Customer Sales and Satisfaction Department. Quantity reprint rates can be obtained from the Customer Sales and Satisfaction Department. To request permission to reprint a technical paper or permission to use copyrighted SAE publications in other works, contact the SAE Publications Group. All SAE papers, standards, and selected books are abstracted and indexed in the Global Mobility Database. No part of this publication may by reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher. ISSN 01 48-71 91 Copyright 1995 Soclety of Automotive Engineers, Inc. Positions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by which discussions will be printed with the paper if it is published in SAE transactions. For permission to publish this paper in full or in part, contact the SAE Publications Group. Persons wishing to submit papers to be considered for presentation or publication through SAE should send the manuscript or a 300 word abstract of a proposed manuscript to: Secretary, Engineering Activity Board, SAE. Printed in USA 90.1 M~DIPG Downloaded from SAE International by University of Wisconsin - Madison , Saturday, September 08, 2018Torque Converter Clutch Slip Control System Katsumi Kono, Hiroshi Itoh, Shinya Nakamura, and Kenichi Yoshizawa Toyota Motor Corp. Masataka Osawa Toyota Central R&D Labs., Inc. ABSTRACT The torque converter clutch slip control system adopted in the Toyota A541 E automatic transaxle en- gages the torque converter clutch by applying a steady slip speed to prevent the torque fluctuation of the en- gine to be transmitted to the drivetrain while enhancing the transmission efficiency of the toque converter. The feedback controller of the slip speed adopts the H, (H- Infinity) control theory which offers a high level of robust stability, and is the first of its kind in a mass produced component. As a result, a highly accurate and reliable system has been realized, contributing to large-scale fuel economy. INTRODUCTION In recent years, technologies for reducing fuel consumption are becoming more important than ever, due to the heightened global interest in protecting the environment. In line with this trend, various improve- ments are also being made to enhance the transmis- sion efficiency of automatic transmissions. Although the torque converter is a part which has the